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"content": "PLEASE IGNORE THIS MESSAGE\n\nHi @@Triad.Microsoft.Development, Please reply with what you were working on yesterday, what you are planning to work on today and if there are any impediments.",

But I saw cases where mentions were not allowed in other connectors to avoid spams (if I am not wrong, the twitter connector doesn't allow that, but worth a try). What I am finding strange that the logic apps engine didn't complain about the @ sign by itself
(as we use @ for expressions).